/*************************************************************************** * ncat_core.h * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2016 Insecure.Com LLC. Nmap is * * also a registered trademark of Insecure.Com LLC. This program is free * * software; you may redistribute and/or modify it under the terms of the * * GNU General Public License as published by the Free Software * * Foundation; Version 2 ("GPL"), BUT ONLY WITH ALL OF THE CLARIFICATIONS * * AND EXCEPTIONS DESCRIBED HEREIN. This guarantees your right to use, * * modify, and redistribute this software under certain conditions. If * * you wish to embed Nmap technology into proprietary software, we sell * * alternative licenses (contact sales@nmap.com). Dozens of software * * vendors already license Nmap technology such as host discovery, port * * scanning, OS detection, version detection, and the Nmap Scripting * * Engine. * * * * Note that the GPL places important restrictions on "derivative works", * * yet it does not provide a detailed definition of that term. To avoid * * misunderstandings, we interpret that term as broadly as copyright law * * allows. For example, we consider an application to constitute a * * derivative work for the purpose of this license if it does any of the * * following with any software or content covered by this license * * ("Covered Software"): * * * * o Integrates source code from Covered Software. * * * * o Reads or includes copyrighted data files, such as Nmap's nmap-os-db * * or nmap-service-probes. * * * * o Is designed specifically to execute Covered Software and parse the * * results (as opposed to typical shell or execution-menu apps, which will * * execute anything you tell them to). * * * * o Includes Covered Software in a proprietary executable installer. The * * installers produced by InstallShield are an example of this. Including * * Nmap with other software in compressed or archival form does not * * trigger this provision, provided appropriate open source decompression * * or de-archiving software is widely available for no charge. For the * * purposes of this license, an installer is considered to include Covered * * Software even if it actually retrieves a copy of Covered Software from * * another source during runtime (such as by downloading it from the * * Internet). * * * * o Links (statically or dynamically) to a library which does any of the * * above. * * * * o Executes a helper program, module, or script to do any of the above. * * * * This list is not exclusive, but is meant to clarify our interpretation * * of derived works with some common examples. Other people may interpret * * the plain GPL differently, so we consider this a special exception to * * the GPL that we apply to Covered Software. Works which meet any of * * these conditions must conform to all of the terms of this license, * * particularly including the GPL Section 3 requirements of providing * * source code and allowing free redistribution of the work as a whole. * * * * As another special exception to the GPL terms, Insecure.Com LLC grants * * permission to link the code of this program with any version of the * * OpenSSL library which is distributed under a license identical to that * * listed in the included docs/licenses/OpenSSL.txt file, and distribute * * linked combinations including the two. * * * * Any redistribution of Covered Software, including any derived works, * * must obey and carry forward all of the terms of this license, including * * obeying all GPL rules and restrictions. For example, source code of * * the whole work must be provided and free redistribution must be * * allowed. All GPL references to "this License", are to be treated as * * including the terms and conditions of this license text as well. * * * * Because this license imposes special exceptions to the GPL, Covered * * Work may not be combined (even as part of a larger work) with plain GPL * * software. The terms, conditions, and exceptions of this license must * * be included as well. This license is incompatible with some other open * * source licenses as well. In some cases we can relicense portions of * * Nmap or grant special permissions to use it in other open source * * software. Please contact fyodor@nmap.org with any such requests. * * Similarly, we don't incorporate incompatible open source software into * * Covered Software without special permission from the copyright holders. * * * * If you have any questions about the licensing restrictions on using * * Nmap in other works, are happy to help. As mentioned above, we also * * offer alternative license to integrate Nmap into proprietary * * applications and appliances. These contracts have been sold to dozens * * of software vendors, and generally include a perpetual license as well * * as providing for priority support and updates. They also fund the * * continued development of Nmap. Please email sales@nmap.com for further * * information. * * * * If you have received a written license agreement or contract for * * Covered Software stating terms other than these, you may choose to use * * and redistribute Covered Software under those terms instead of these. * * * * Source is provided to this software because we believe users have a * * right to know exactly what a program is going to do before they run it. * * This also allows you to audit the software for security holes. * * * * Source code also allows you to port Nmap to new platforms, fix bugs, * * and add new features. You are highly encouraged to send your changes * * to the dev@nmap.org mailing list for possible incorporation into the * * main distribution. By sending these changes to Fyodor or one of the * * Insecure.Org development mailing lists, or checking them into the Nmap * * source code repository, it is understood (unless you specify otherwise) * * that you are offering the Nmap Project (Insecure.Com LLC) the * * unlimited, non-exclusive right to reuse, modify, and relicense the * * code. Nmap will always be available Open Source, but this is important * * because the inability to relicense code has caused devastating problems * * for other Free Software projects (such as KDE and NASM). We also * * occasionally relicense the code to third parties as discussed above. * * If you wish to specify special license conditions of your * * contributions, just say so when you send them. * * * * This program is distributed in the hope that it will be useful, but * * WITHOUT ANY WARRANTY; without even the implied warranty of * * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the Nmap * * license file for more details (it's in a COPYING file included with * * Nmap, and also available from https://svn.nmap.org/nmap/COPYING) * * * ***************************************************************************/ /* $Id$ */ #ifndef NCAT_CORE_H #define NCAT_CORE_H #include "nsock.h" #include "nbase.h" #include "util.h" #include "sockaddr_u.h" /* Maximum size of the srcaddrs array. In this case two because we can only have a IPV4 INADDR_ANY and a IPV6 in6addr_any at most or a user defined address */ #define NUM_LISTEN_ADDRS 2 extern union sockaddr_u listenaddrs[NUM_LISTEN_ADDRS]; extern int num_listenaddrs; extern union sockaddr_u srcaddr; extern size_t srcaddrlen; extern union sockaddr_u targetss; extern size_t targetsslen; enum exec_mode { EXEC_PLAIN, EXEC_SHELL, EXEC_LUA, }; struct options { unsigned short portno; int verbose; int debug; char *target; int af; /* IPPROTO_TCP, IPPROTO_SCTP, or IPPROTO_UDP */ int proto; int broker; int listen; int keepopen; int sendonly; int recvonly; int noshutdown; int telnet; int linedelay; int chat; int nodns; const char *normlog; const char *hexlog; int normlogfd; int hexlogfd; int append; int idletimeout; int crlf; /* Were any hosts specifically allowed? If so, deny all others. */ int allow; int deny; struct addrset allowset; struct addrset denyset; int httpserver; int nsock_engine; /* Output messages useful for testing to stderr? */ int test; /* Loose source-routing stuff */ struct in_addr srcrtes[8]; int numsrcrtes; int srcrteptr; /* Maximum number of simultaneous connections */ int conn_limit; int conntimeout; /* When execmode == EXEC_LUA, cmdexec is the name of the file to run. */ char *cmdexec; enum exec_mode execmode; char *proxy_auth; char *proxytype; char *proxyaddr; int ssl; char *sslcert; char *sslkey; int sslverify; char *ssltrustfile; char *sslciphers; int zerobyte; }; extern struct options o; /* The time the program was started, for exit statistics in connect mode. */ extern struct timeval start_time; /* Initializes global options to their default values. */ void options_init(void); /* Resolves the given hostname or IP address with getaddrinfo, and stores the first result (if any) in *ss and *sslen. The value of port will be set in the appropriate place in *ss; set to 0 if you don't care. af may be AF_UNSPEC, in which case getaddrinfo may return e.g. both IPv4 and IPv6 results; which one is first depends on the system configuration. Returns 0 on success, or a getaddrinfo return code (suitable for passing to gai_strerror) on failure. *ss and *sslen are always defined when this function returns 0. If the global o.nodns is true, then do not resolve any names with DNS. */ int resolve(const char *hostname, unsigned short port, struct sockaddr_storage *ss, size_t *sslen, int af); int fdinfo_close(struct fdinfo *fdn); int fdinfo_recv(struct fdinfo *fdn, char *buf, size_t size); int fdinfo_send(struct fdinfo *fdn, const char *buf, size_t size); int fdinfo_pending(struct fdinfo *fdn); int ncat_recv(struct fdinfo *fdn, char *buf, size_t size, int *pending); int ncat_send(struct fdinfo *fdn, const char *buf, size_t size); /* Broadcast a message to all the descriptors in fds. Returns -1 if any of the sends failed. */ extern int ncat_broadcast(fd_set *fds, const fd_list_t *fdlist, const char *msg, size_t size); /* Do telnet WILL/WONT DO/DONT negotiations */ extern void dotelnet(int s, unsigned char *buf, size_t bufsiz); /* sleep(), usleep(), msleep(), Sleep() -- all together now, "portability". * * There is no upper or lower limit to the delayval, so if you pass in a short * length of time <100ms, then you're likely going to get odd results. * This is because the Linux timeslice is 10ms-200ms. So don't expect * it to return for at least that long. * * Block until the specified time has elapsed, then return 1. */ extern int ncat_delay_timer(int delayval); /* Open a logfile for writing. * Return the open file descriptor. */ extern int ncat_openlog(const char *logfile, int append); extern void ncat_log_send(const char *data, size_t len); extern void ncat_log_recv(const char *data, size_t len); extern int ncat_hostaccess(char *matchaddr, char *filename, char *remoteip); /* Make it so that line endings read from a console are always \n (not \r\n). Defined in ncat_posix.c and ncat_win.c. */ extern void set_lf_mode(void); extern int getaddrfamily(const char *addr); extern int setenv_portable(const char *name, const char *value); extern void setup_environment(struct fdinfo *fdinfo); #endif